The resistor and the capacitor together were the timer, and the transistor worked as the switch.
电阻器和电容器一起组成计时器，晶体管作为开关。
2
This constant voltage system key lies in the control system the design, and switchtransistor choice and application.
该稳压系统的关键在于控制系统的设计，及开关晶体管的选择及应用。
3
The operation modes of the interleaved double-transistor flyback converter have been analyzed. The DCM small signal AC model using the averaged switch method has been built up.